Droppage drag for stokers



Feb. 3, 192 7 1,524,952

H; A. POPPENHUSEN DROPPAGE one FOR STOKERS Filed Aprii 2, 19 2 Shuts-Shut 1 Feb, 3. 1925.

H. A. POPPENHUSEN DROPPAGE DRAG FOR STOKERS Filed April 2, 1921 2 Shuts-Shut z Patented Feb. 3, 1925.

UNITED STATES PATENT OFFICE.

HERMAN A. POPPENHUSEN, OF HAMMOND, INDIANA, ASSIGNOR TO GREEN ENGINEER- ING COMPANY, OF EAST CHICAGO, INDIANA, A CORPORATION OF ILLINOIS.

DROPPAGE DRAG FOR STO'KERS.

Application filed April 2, 1921,

T 0 all whom it may concern Be it known that I, HERMAN A. POPPEN- HUSEN, a citizen of the United States, residing at Hammond, in the county of Lake and State of Indiana, have invented new and useful Improvements in Droppage Drags for Stokers, of which the following is a specification.

This invention relates to droppage drags for chain grate and other stokers and consists in the matters hereinafter described and more particularly set forth in the appended claims.

In the accompanying drawings- Fig. 1 is a vertical longitudinal sectional view taken through a furnace provided with a chain grate stoker equipped with a droppage drag of my invention;

Fig. 2 is a. vertical sectional view taken on line 22 of Fig. 1;

Fig. 3 is a horizontal sectional view taken on line 33 of Fig. 2; and

Fig. 4 is a perspective view of one of the drags.

In the drawings, 1 indicates a chain grate stoker having top and bottom leads 2, 2. On opposite sides of the stoker are vertical air ducts 1, 1, divided from each other by upright partition walls 5, 5, which with the side walls of the furnace setting define the ducts. Said ducts open into the space between the grate leads to sup-ply draft to the top lead from its under side.

Below the bottom lead 3 are a. plurality of I-beams 6 extending across the stoker structure between the side plates 7, 7 thereof. Across these beams extend skids 8, 8 to support the bottom lead 3 of the grate 1. Below the I-beams 6 is a horizontal droppage collecting floor 9 extending between the side plates 7, 7 and constituting the top wall of a plurality of horizontally extending air conduit-s10, 11, and 12.

The side plates 7 extend above the bottom lead 3 and there have inwardly extending flanges to support a horizontal flat plate 13, between the top and bottom leads of the grate and on which falls the droppage which sifts through the top lead. Extending across the plate 13 are a number of vertical members 14, 14, which not only support the skids 15 for the top lead 2 but also divide the space between the top lead and the plate 13 into transverse draft supply chambers. These partition members let Serial No. 458,037.

are equal in number to the partition walls 5 and are in the same planes respectively. The middle air supply conduit 11 below the floor 9 communicates with the rear chamber formed beneath the top lead 2, and the supply conduits 10 and 12 communicate, respectively, with the opposite sides of the intermediate chamber beneath the top lead 2. The. front walls 16, 17 of the furnace setting extend to the side plates 7, 7 of the stoker, as shown in Fig. 3. These walls form the front walls of the vertical ducts 4, a at the front or forward end of the grate. Said ducts 4, A open at their upper ends into the draft supply chamber at the front end of the grate and communicate at their lower ends with the main draft supply conduit 18 (Fig. 1) for said chamber. The conduits 10, 11 and 12 all open at one end into the supply conduit 18 (Fig. 1), which is connected with a blower to supply a. forced draft to the grate. The arrangement of conducts and chambers, as described, is similar to that disclosed in my prior Patent No. 1,243,869, granted August 23, 1917.

As illustrated in Fig. 1, the partitions 1 L, 14L divide the space between the plate 13 and the top lead 2 into three chambers, a front one and a rear one, and an intermediate one. In each of these chambers is a droppage drag 19. Each drag 19 is arranged to extend between the partitions 141; bet-ween which it is located, and is in the form of a bar in the shape of an inverted Y, so that in resting on the plate 13 it will scrape over the plate when -moved laterally in. either direction. To move the several drags 19 across the plate 13, in either direction, I provide two horizontally arranged shafts 20, 20, one on. each side of the grate. and above the plane of the plate 13, as shown in Fig. 2. These shafts 20 extend through and are journaled in the partition walls 5, and are also journaled in the front walls 16, 17, as shown in Fig. 3. Connected with each drag 19 are flexible members or sprocket chains 21, which are trained about sprocket wheels 22 fixed to the shafts 20.

One of the shafts 20 extends beyond the front wall 17 and is there provided with a beveled gear 23 which meshes with a beveled pinion 2 1- on a shaft journaled in a bracket or bearing 25 secured to the front llt) wall 17. To this shaft is-secured a hand wheel 26 by means of which the several drags 19 may be moved simultaneously across the plate 13 in the same direction. Ti'hen the hand wheel 25 is turnedin' one direction, the drags 19 are all moved toward one side edge of the plate 18 and scrape the droppage from the plate and discharge it into the ducts ettoward which the drags are moved. Turning the hand wheel 26 in the opposite direction, moves the drags. toward the other side. edge of the plate and discharges the droppage into the ducts l at that side of the plate. This permits clearing the plate 13 in all of the chambers from droppage, and thus prevents the droppage accumulating and hindering the free flow of forced or other draft to the grate.

To direct the droppage discharged over either side edge of the plate 13 by the drags 19 onto the collecting floor 9, I provide on opposite sides of the grate structure a plu rality of vertically arranged damper plates 27, 28. The dampers 27 are on one side of the stoker and the ones 28 are on the opposite side. There is an equal. number of damper plates on each side of the Stoker and these plates are arranged, two for each chamber or compartment, and to open and close the openings 29 provided in the side plates 7, 'T-of the stoker. These damper plates are hinged at their lower edges to the side plates 7 and when swung into open position, as shown in dotted lines in Fig; 2, extend across the ducts 1 and shutoff the forced draft to the top lead 2 of the grate. hen in this position, the damper plates 2?, 28 catch the droppage discharged over the side edges of the plate 13 and direct the droppage onto the floor 9, from which it may be hoed from the front -of the furnace through an opening 30, as shown in Fig. 1. When the damper plates 27, 28 are closed, they occupy the positions shown in full lines in Figs. 2 and 3, and thus allow the top lead of the grate to be under forced draft from all of the compartments.

To swing the damper plates 27,- 28 into and out of these positions, I provide for the plates 27 three shafts 31, and and for the plates 28 a like number of shafts 3 1, 35, and 36. Each set of shafts tclescope on each other and extend through and are journaled in the L'beams 6 above the floor-9. The shafts 31 and 34 are for the setof dampers 27, 28 at the rear of the stoker, the shafts 33 and 36 are for the set of dampers 27, 28 at the front end of the stoker, and the shafts 32 and 35 are for the intermediate set of dampers 27, 28,- as shown in Fig. 1. Each damper-.27, 28 is connected with'its shaft by a link 37- and arm 38, as shown in Fig. 2. As illustrated in Figs. 1 and 3, these shafts extend beyond the front end vof the stoker to allow the hand levers 31 to 36, with which the shafts are provided, to extend upright and clear of the chain grate 1.

By the construction described, the several damper plates 27, 28 may be swung independently of each other into open and closed positions. When droppage collected on the plate 13 is to be discharged there from, all of the damper plates on each side of the stoker are swung into open position, as shown in dotted lines in. Fig. 2. When thus positioned, forced draftto the entire lengthv of the toplead 2 is out off and blowing of the droppage up against the top lead prevented. This enables the plate 18 for all chambers to be cleared of"droppage, and accumulation of it prevented. Should it be desired to place the entire grate length under forced draft,a1l.of the damper plates areswung into closed position.- On the other hand, should it be desired, during. the operation of the stoker, to subject only one or more portions of the-grate to forced draft, the damper plates for the other portions of the grate are swung into open position to extend across the ducts 4 and out off the draft to the last mentionedportions of the grate.

By the use of droppagedrags 19 as described, the droppage may-be scraped from the plate 13, and thus that may be made flat and be horizontally arranged. This permits the stoker to be constructed to any width required while still keeping j. the height of the stoker the same for all widths. In. my said prior patent, the floor beneath the top lead of the grate is made gabled or v inclined so that droppage will roll-off the same. To be effective, the inclination has tobe at-a certain relatively steep angle, which limited the construction to relatively narrow stokersv In wider stokers, the inclination required. was such that the height of the top lead of the grate increased in proportion to the width of'the grate. Vith the drag construction herein disclosed, the inclination mentioned is not a factor, and consequently the width of the grates may vary without affecting the height of the st cker.

Vhilei I have shownand described here. in in detail a construction embodying the features of my invention, it'is to be of course understood that the details of construction and arrangement of parts illustrated may be variously changed and moditied without departing from the spirit and scope of my invention.

1 claim as my invention:

1. The combination with'an endless chain grate having top and bottom leads, of a droppa e plate between said'grate leads. transverse members dividing the space be tween said upper lead and droppageplate into a plurality of chambers for supplying draft to the portions of the upper lead thereover, said plate forming the bottom wall of said chambers, and mechanically actuated means in each chamber for scraping droppage from said plate and discharging the same over either of the side edges thereof.

2. Thecombination with an endless chain grate having top and bottom leads, of a droppage plate between said grate leads, transverse members dividing the space between said upper lead and droppage plate into a plurality of chambers for supplying draft to the portions of the upper lead thereover, said plate forming the bottom wall of said chambers, a drag in each chamber, and means for moving the drags of all chambers simultaneously over said plate for scraping droppage from all chambers and discharging the same over either of the side edges of said plate.

3. The combination with an endless chain grate having top and bottom leads, of a droppage plate between said grate leads, transverse members dividing the space between said upper lead and droppage plate into a plurality of chambers, said plate forming the bottom wall of said chambers, vertical air ducts on opposite sides of said grate and opening into said chambers for supplying draft thereto, a drag in each chamber, and means for moving said drags over said plate for discharging droppage over either of the side edges thereof into said air ducts.

f. The combination with an endless chain grate having top and bottom leads, of a droppage plate between said grate leads, transverse members dividing the space between said upper lead and droppage plate into a plurality of chambers, said plate form ing the bottom wall of said chambers, vertical air ducts on opposite sides of said grate and opening into said chambers for supplying draft thereto, a drag in each chamber, shafts on opposite sides of said grate, sprocket wheels on said shafts, sprocket chains connccted with said drags on opposite sides thereof and engaging said sprocket wheels, and means for turning said shafts in either direction to move the drags over said plate.

5. The combination with an endless chain grate having top and bottom leads, of a droppage plate between said grate leads, transverse members dividing the space between said upper lead and plate into a plurality of chambers, said plate forming the bottom wall of said chambers, air ducts on opposite sides of the grate and opening into said chambers for supplying draft thereto, a droppage collecting floor beneath the lower lead, mechanical means in each chamber for scraping droppage from said plate into said air ducts, and hinged dampers to be swung outward into positions extending across said air ducts to catch the droppage discharged from said plate and direct the same onto said floor.

6. The combination with an endless chain grate having top and bottom leads, of a droppage plate between said grate leads, transverse members dividing the space be tween said upper lead and plate into a plurality of chambers, said plate forming the bottom wall of said chambers, air ducts on opposite sides of the grate and opening into said chambers for supplying draft thereto, a droppage collecting floor beneath the lower lead, mechanical means in each chamber for scraping droppage from said plate into said air ducts, hinged dampers to be swung outward into positions extending across said air ducts to catch the droppage discharged from said plate and direct the same onto said floor, and means for operating said dampers independently of each other.

7. The combination with an endless chain grate having top and bottom leads, of a flat horizontal droppage plate between said great leads, transverse members dividing the space between said upper lead and plate into a plurality of chambers, said plate forming the bottom wall of said chambers, air ducts on opposite sides of the grate and opening into said chambers for supplying draft thereto, a droppage floor below the bottom lead, means in each chamber for scraping the droppage from said plate into said air ducts, hinged dampers to be swung outward into positions extending across said air ducts to catch the droppage discharged from said plate and direct the same onto said floor, and draft supply conduits under said floor and connected with said ducts at the sides of the grate.

8. The combination with an endless chain grate having top and bottom leads, of a droppage plate between said grate leads,

transverse members dividing the space between said upper lead and plate into a plurality of chambers, said plate forming the bot-tom wall of said chambers, air ducts on opposite sides of the grate and opening into said chambers for supplying draft thereto, a droppage collecting floor beneath the lower lead, means in each chamber for scraping droppage from said plate into said air ducts, hinged dampers to be swung outward into positions extending across said air ducts to catch the droppage discharged from said plate and direct the same onto said floor, and means including telescopic shafts for actuating said dampers.

In testimony that I claim the foregoing as my invention, I affix my signature this 30th day of March, A. D. 1921.

HERMAN A. POPPENHUSEN.

lliS 

